        <style>
            body {
                background-color:grey;
            }
        </style>

<?php
echo CHtml::beginForm('http://v0.api.upyun.com/' . $bucket, 'post', array('enctype' => 'multipart/form-data'));
//echo CHtml::hiddenField('bucket', $bucket);
echo CHtml::hiddenField('policy', $policy);
echo CHtml::hiddenField('signature', $signature, array('readonly' => false));
echo CHtml::fileField('file');
echo CHtml::submitButton('上传');
echo CHtml::endForm();

?>